Market Share Deconstructed

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John Gruber has an excellent deconstruction of Apple's market share as usually seen by the PC industry analysts:

The idea of overall PC market share, as currently conceived by IDC, is not so much like overall automobile market share as it is like overall motor vehicle market share. It’s like counting everything from golf carts to tractor trailers as a single category, thus making the “overall market share” look worse than it is for a company that only makes actual passenger cars.

Bien vu.